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Schedulix is the Open Source Enterprise Job Scheduling System, which meets the complex requirements of modern IT process automation. It helps to create Complex workflow, Hierarchical workflow modelling, Workflows can be dynamically submitted or paralleled, Automatic reruns of sub-workflow, Load balancing, Sticky allocations, Time scheduling and lot more.

Chronos is a replacement for cron. It is a distributed and fault-tolerant scheduler that runs on top of Apache Mesos that can be used for job orchestration. It supports custom Mesos executors as well as the default command executor. Thus by default, Chronos executes sh (on most systems bash) scripts. Chronos can be used to interact with systems such as Hadoop (incl. EMR), even if the Mesos agents on which execution happens do not have Hadoop installed. Included wrapper scripts allow transfering files and executing them on a remote machine in the background and using asynchronous callbacks to notify Chronos of job completion or failures. Chronos is also natively able to schedule jobs that run inside Docker containers.

Dkron is written in Go and leverage the power of distributed key-value stores and serf for providing fault tolerance, reliability and scalability while keeping simple and easily instalable. Dkron is inspired by the google whitepaper Reliable Cron across the Planet and by Airbnb Chronos borrowing the same features from it.

Later is a library for describing recurring schedules and calculating their future occurrences. It supports a very flexible schedule definition including support for composite schedules and schedule exceptions. Create new schedules manually, via Cron expression, via text expressions, or using a fully chainable API. For more information on SemVer, please visit http://semver.org/.

minicron makes it simple to monitor your cron jobs and ensure they are running both correctly and on schedule. Latest stable release in 0.9.7 tag but 0.9.x is not being actively developed/supported. This branch is under active development for 1.0.0.

Cron is a tool that allows you to execute something on a schedule. This is typically done using the cron syntax. We allow you to execute a function whenever your scheduled job triggers. We also allow you to execute a job external to the javascript process using child_process. Additionally, this library goes beyond the basic cron syntax and allows you to supply a Date object. This will be used as the trigger for your callback. Cron syntax is still an acceptable CronTime format. Although the Cron patterns supported here extend on the standard Unix format to support seconds digits, leaving it off will default to 0 and match the Unix behavior. Because we can't magically know what you are doing to expose an issue, it is best if you provide a snippet of code. This snippet need not include your secret sauce, but it must replicate the issue you are describing. The issues that get closed without resolution tend to be the ones without code examples. Thanks.

cronsun is a distributed cron-style job system. It's similar with crontab on stand-alone *nix. The goal of this project is to make it much easier to manage jobs on lots of machines and provides high availability. cronsun is different from Azkaban, Chronos, Airflow.

healthchecks is a watchdog for your cron jobs. It's a web server that listens for pings from your cron jobs, plus a web interface. These are instructions for setting up healthchecks Django app in development environment.

A replacement for cron, with sophisticated status-reporting and error-handling. Jobber is a lightweight utility for Unix-like systems that can run arbitrary commands, or "jobs", according to a schedule. It is meant to be a replacement for the classic Unix utility cron.

Exq is a job processing library compatible with Resque / Sidekiq for the Elixir language.While you may reach for Sidekiq / Resque / Celery by default when writing apps in other languages, in Elixir there are some good options to consider that are already provided by the language and platform. So before adding Exq or any Redis backed queueing library to your application, make sure to get familiar with OTP and see if that is enough for your needs. Redis backed queueing libraries do add additional infrastructure complexity and also overhead due to serialization / marshalling, so make sure to evaluate whether or it is an actual need.

Crono is a time-based background job scheduler daemon (just like Cron) for Ruby on Rails. Currently, there is no such thing as Ruby Cron for Rails. Well, there's Whenever but it works on top of Unix Cron, so you can't manage it from Ruby. Crono is pure Ruby. It doesn't use Unix Cron and other platform-dependent things. So you can use it on all platforms supported by Ruby. It persists job states to your database using Active Record. You have full control of jobs performing process. It's Ruby, so you can understand and modify it to fit your needs.

Rundeck is an open source automation service with a web console, command line tools and a WebAPI. It lets you easily run automation tasks across a set of nodes. It can schedule a job, more secure replacement of cron. It provides support for runbook automation where it can execute common set of reusable procedures.

Bistro is a toolkit for making services that schedule and execute tasks. Bistro is a toolkit for making distributed computation systems. It can schedule and run distributed tasks, including data-parallel jobs. It enforces resource constraints for worker hosts and data-access bottlenecks. It supports remote worker pools, low-latency batch scheduling, dynamic shards, and a variety of other possibilities. It has command-line and web UIs.

evQueue is an open source job scheduler and queueing engine. It features an event-driven C++ engine and a PHP / MySQL web control interface which provides tasks monitoring and creation. It provides both simple task execution and complex task chaining (workflow) using an easy to use drag & drop web interface. Workflow description includes output linking to input, conditions, loops... Queues management provides an easy way for task parallelization and resource control.

pg_cron can run multiple jobs in parallel, but it runs at most one instance of a job at a time. If a second run is supposed to start before the first one finishes, then the second run is queued and started as soon as the first run completes. An easy way to create a cron schedule is: crontab.guru.